look qtopia sources:
start here to see what happend when you trying to enable headset:
src/settings/btsettings/remotedeviceinfodialog.cpp at c34a919b969552f68b8e18555b9528aca7bb286e from muromec's qtopia-ezx - GitHub
here must be something to handle soundcard/bt audio switch:
src/plugins/audiohardware/ezx/ezxaudioplugin.cpp at ae11d9fe3bf7333f0d204784c26f90883dd036ee from muromec's qtopia-ezx-device - GitHub
also we can have some bt protocols disabled in kernel.




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